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|
{- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# LANGUAGE OverloadedStrings #-}
module Storage.Network (Server(..), networkServers, networkStorage) where
import Types
import Types.Storage
import HTTP
import HTTP.Client
import Servant.Client
import Network.Wai.Handler.Warp (Port)
import Network.HTTP.Client (Manager, newManager, defaultManagerSettings)
import Control.Monad.Trans.Except (ExceptT, runExceptT)
data Server = Server
{ serverName :: String
, serverPort :: Port
}
serverUrl :: Server -> BaseUrl
serverUrl srv = BaseUrl Http (serverName srv) (serverPort srv) ""
networkServers :: IO [Server]
networkServers = return
[ Server "localhost" 8080
, Server "localhost" 8080
, Server "localhost" 8080
]
networkStorage :: Server -> Storage
networkStorage server = Storage
{ storeShare = store server
, retrieveShare = retrieve server
, obscureShares = obscure server
, countShares = count server
, moveShares = move server
}
store :: Server -> StorableObjectIdent -> Share -> IO StoreResult
store srv i (Share _n o) =
serverRequest srv StoreFailure id $ \pow ->
putObject i pow o
retrieve :: Server -> ShareNum -> StorableObjectIdent -> IO RetrieveResult
retrieve srv n i =
serverRequest srv RetrieveFailure (RetrieveSuccess . Share n) $
getObject i
-- | Servers should automatically obscure, so do nothing.
-- (Could upload chaff.)
obscure :: Server -> IO ObscureResult
obscure _ = return ObscureSuccess
count :: Server -> IO CountResult
count srv = serverRequest srv CountFailure id countObjects
-- | Not needed for servers.
move :: Server -> Storage -> IO ()
move _ _ = error "move is not implemented for servers"
serverRequest
:: Server
-> (String -> a)
-> (r -> a)
-> (Maybe ProofOfWork -> Manager -> BaseUrl -> ExceptT ServantError IO (ProofOfWorkRequirement r))
-> IO a
serverRequest srv onerr onsuccess a =
go Nothing =<< newManager defaultManagerSettings
where
url = serverUrl srv
go pow manager = do
res <- runExceptT $ a pow manager url
case res of
Left err -> return $ onerr $
"server failure: " ++ show err
Right (Result r) -> return $ onsuccess r
Right needpow -> error "NEEDPOW" -- loop with pow
|
